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tpm2: add sm3 256 hash support

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add sm3 256 hash support, so TPM2 chips which report
5 pcrs with sm3 hash do not fail with:

  u-boot=> tpm2 autostart
  tpm2_get_pcr_info: too many pcrs: 5
  Error: -90

Signed-off-by: Heiko Schocher <hs@nabladev.com>
This commit is contained in:
Heiko Schocher
2025-11-18 05:30:41 +01:00
committed by Tom Rini
parent 213601a600
commit 7c3f05ad51
5 changed files with 27 additions and 2 deletions
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3
lib/efi_loader/efi_tcg2.c
View File

@@ -430,6 +430,9 @@ static efi_status_t tcg2_hash_pe_image(void *efi, u64 efi_size,
case TPM2_ALG_SHA512:
hash_calculate("sha512", regs->reg, regs->num, hash);
break;
case TPM2_ALG_SM3_256:
hash_calculate("sm3_256", regs->reg, regs->num, hash);
break;
default:
continue;
}

4
lib/tpm-v2.c
View File

@@ -686,10 +686,10 @@ int tpm2_get_pcr_info(struct udevice *dev, struct tpml_pcr_selection *pcrs)
pcrs->count = get_unaligned_be32(response);
/*
* We only support 4 algorithms for now so check against that
* check against the supported algorithms in hash_algo_list,
* instead of TPM2_NUM_PCR_BANKS
*/
if (pcrs->count > 4 || pcrs->count < 1) {
if (pcrs->count > ARRAY_SIZE(hash_algo_list) || pcrs->count < 1) {
printf("%s: too many pcrs: %u\n", __func__, pcrs->count);
return -EMSGSIZE;
}

9
lib/tpm_tcg2.c
View File

@@ -12,6 +12,7 @@
#include <u-boot/sha1.h>
#include <u-boot/sha256.h>
#include <u-boot/sha512.h>
#include <u-boot/sm3.h>
#include <version_string.h>
#include <asm/io.h>
#include <linux/bitops.h>
@@ -143,6 +144,12 @@ int tcg2_create_digest(struct udevice *dev, const u8 *input, u32 length,
sha512_finish(&ctx_512, final);
len = TPM2_SHA512_DIGEST_SIZE;
break;
#endif
#if IS_ENABLED(CONFIG_SM3)
case TPM2_ALG_SM3_256:
sm3_hash(input, length, final);
len = TPM2_SM3_256_DIGEST_SIZE;
break;
#endif
default:
printf("%s: unsupported algorithm %x\n", __func__,
@@ -319,6 +326,7 @@ static int tcg2_replay_eventlog(struct tcg2_event_log *elog,
case TPM2_ALG_SHA256:
case TPM2_ALG_SHA384:
case TPM2_ALG_SHA512:
case TPM2_ALG_SM3_256:
len = tpm2_algorithm_to_len(algo);
break;
default:
@@ -431,6 +439,7 @@ static int tcg2_log_parse(struct udevice *dev, struct tcg2_event_log *elog,
case TPM2_ALG_SHA256:
case TPM2_ALG_SHA384:
case TPM2_ALG_SHA512:
case TPM2_ALG_SM3_256:
len = get_unaligned_le16(&event->digest_sizes[i].digest_size);
if (tpm2_algorithm_to_len(algo) != len) {
log_err("EventLog invalid algorithm length\n");